The bathroom's a different beast - It's a bright room, with 3 windows - and white tiles seemed a little bit stark (also we'd only just sold the leftover kitchen tiles on ebay and it pained us to buy more)
Anyway - turns out tiles samples are a thing, and a very necessary thing. Many of these tiles are very different from the pictures on the internet - at least 2 of them are called duck egg' and a different from both the duck egg toilet seat we already have and any duck egg we've eaten.
The middle turquoise one that everyone liked on Facebook has a crackle glaze and the guy in the shop couldn't quite convince us it would work in a bathroom. What we also learnt is the difference in looking at tiles in different rooms and lights is outstanding. Tiles we liked downstairs looked like sludge upstairs and one's we'd discounted earlier suddenly came into their own.
So Metro Atlantis blue tiles it is =D Let's hope a wall of them isn't too much.